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AN579 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN579
Description  PROTECTION CONCEPTS IN TELECOMMUNICATIONS EQUIPMENT
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN579 Datasheet(HTML) 7 Page - STMicroelectronics

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AN579 APPLICATION NOTE
Figure 12. Fuse blowing function
These components provide an absolute security after action, but their major disadvantage is the need for
maintenance.
Figure 13. PTC based protection
The PTC thermistor is a device which operates by very rapid resistance increase as a function of the tem-
perature.
When the surge occurs across the line, the parallel protection PP is activated.
The surge current Is, generated by PP action, flows through the PTC device and increases its internal tem-
perature. As shown in Figure 14 the resistance value of the PTC device rises quickly with the temperature.
.01
.1
1
10
100
t (s)
I (A)
10
2.5A
1
100
LINE
EXCHANGE
PTC
PTC
Is
PP
PP


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